Should it not be available from it's homepage, you can also get it from the levelbase
TReditor(3d) newest and older versions (http://www.laraslevelbase.org/stuff/index.asp?Kat_1=%25&name=treditor&Beschreibung=&submit=search&id=%25)
unofficial editor starter kit (in german) (http://www.laraslevelbase.org/stuff/feed.asp?id=2148&obj=Unoff.%20Editor%20Starter%20Kit)